Zipper with White Block Reclosable Plastic Bags 12" x 15" 4 Mil Clear Large Polybag 1000 Count Made from 100% Virgin Low Density Polyethylene (LDPE). Meets FDA and USDA requirements. Offset lip dimensions: Front:- 0.5 Back:- 0.675. White Block Design for easy identification. Opaque White Area can be used to Label Products. Durable Polyethylene Surface and Water-resistant. 4 - Millimeter Gauge Thickness. Provides an economically advantageous method for storage, packaging, stocking and shipping.